# math

if a=6 and b=-4, solve...(4a+4b) (4a-4b)

1. 👍
2. 👎
3. 👁
1. If I remember correctly,
a and b are variables. So you will substitute the value of a (which is 6) and the value for b (which is -4) into the problems.

Before you do that, remeber that 4a is actually 4 x a or, once you change the variable a to 6, 4 x 6 or 24. The same with 4b. 4b = 4 x b =4 x -4 = -16.

Do that for the numbers inside each parenthesis. Then perform the mathematical operation inside parenthesis. For the first parenthesis, the answer would be 24 + -16 which actually is 24-16 or 8. Repeat for the second parenthesis. Then multiply the sum in the first parenthesis by the difference in the second parenthesis.

Remember that when you multiply two negative numbers, the answer is positive. When you multiply a positive and negative number, the answer is negative.

1. 👍
2. 👎
2. (4a+4b) (4a-4b)
=4(a+b)4(a-b) , see the difference of squares?
= 16(a^2 - b^2)
= 16(36-16)
= 16(20)= 320

1. 👍
2. 👎
3. i need help w/ math and parentheses here is the question: 5=3+4-2/1 and i have to add parentheses.

1. 👍
2. 👎

## Similar Questions

1. Solve the system of equations y=2x^2-3 y=3x-1 a)no solution b)(-1/2,5),(2,-5/2) c)(-1/2,-5/2),(2,5)**** d)(1/2,5/2),(2,5) 2. How many real number solutions are there to the equation 0=-3x^2+x-4? a)0 ***** b)1 c)2 d)3 3.solve

2. ### Algebra

To solve the system of equations, which expression could be substituted for x into the first equation? 3x-5y=14 x+4y=10 a)10-4y b)4y+10 c)(1/4)x+(5/2) d)(-1/4)x+(5/2) I have another problem just like this one so if you could

3. ### How do I do this.?(Math.)

Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve one of the equations for x or y. Let's solve the first one for y: y - 2x = -5 y = 2x - 5 Now let's substitute 2x - 5 for y in the second

4. ### algebra

solve for the indicated variable: a. temperature formula solve for F: K=5/9(F-32)+273 b. annual interest rate solve for R: A=P+Prt

1. ### math

What is the first step in solving the linear system {2x−3y=11 {−x+5y=−9 by the substitution method in the most efficient way? A. Solve the first equation for x. B. Solve the first equation for y. C. Solve the second equation

2. ### Math

1. Solve the equation. -6g = 42 a. g = 7 b. g = -7 c. g = 252 d. g = -252 2. Solve the equation. x/8 = 16 a. x = 128 b. x = 24 c. x = 8 d. x = 2 3. Solve the equation. 12m = 14.4 a. m = 120 b. m = 12 c. m = 1.2 d. m = 0.12 4.

3. ### math

What is the first step in solving the linear system {2x − 3y = 11 {−x + 5y = −9 by the substitution method in the most efficient way? A. Solve the first equation for x. B. Solve the first equation for y. C. Solve the second

4. ### algebra

1. solve 2x + y = 7 for y 2. solve 2y - 18x = 26 for y 3. solve 20x + 5y =15 for y 4. solve 9x - y = 45 for y 5. solve 6x - 3y = -6 for y 6. solve 4x - 5 = 7 + 4y for y

1. Solve for x. 4(x - b) = x b = 4/3x b = 3/4x x = 4/3b x = 3/4b 2. Solve for y, then find the value of y when given x = 2. 6x = 7 - 4y -12 7/4 19/4 24 I need help solving these. Can you please explain how to solve these problems?

2. ### Math

I just don't understand this question: h(t)=A*b^x h(3)=4 h(5)=40 Solve for b Would you plug 3 into the x and set it equal to 4? (4=A*b^3) How would you solve for that because in the next question they go on to ask you to solve for

3. ### Math

Solve by eliminnation methods 2x-4y=5 2x-4y=6 solve the system by elimination method 5x+2y= -13 7x-3y=17 Solve x+64 Determine whether the given numbers are solutions of the inequality 8,-10,-18,-3 y-8>2y-3 Solve by the

4. ### Substitution Method-Plz help

Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=-4 (y+2) + y = -4 solve for y. Then, x= y+2 i don't get