I'm afraid I do not catch your question.
Are you supposed to find f(4b) when f(x)=4x^2+5x-5? Or are you supposed to find f(x) when f(4b)=4x^2+5x-5. The second option does not make sense because the expression f(4b) should not leave any trace of "x" when x=4b.
Would the question then be:
If f(x)=4x^2+5x-5, find f(4b).
In this case,
f(4b)= 4(4b)² + 5(4b) -5
= 4(16b²) + 20b -5
= 64b² + 20b -5
Okay thank you that really makes more since your a lifesaver! Do you know how to do number 2 and 3 that you could walk me through too? I have literally tried them 11 times and it still says they are wrong
First step: write down the function in terms of x:
Then substitute x by what is in the parentheses (x+1) in this case. Don't forget the parentheses everywhere you make a substitution:
f(x+1)=8(x+1)² + (x+1) - 3
Expand and collect terms as required:
=8(x+1)² + (x+1) - 3
=8(x²+2x+1) + x+1 -3
=8x² + 16x + 8 +x+1 -3
=8x² + 17x + 6
Proceed the same way for number 3. Post for checking if necessary. The answer is 8x²-x-3.
algbra - i was wondering what did i do wrong in this 10. Divide (3x – 2)(x - 4...
Math - Can someone please check my answers below for accurateness? The ...
math, beginning algebra - how do you solve this i've tried many ways and i ...
Math - Solve each equation by completing the square. -36x=8x^2+28 -8x^2-3x=-5 5x...
Math - Solve each equation by completing the square. -36x=8x^2+28 -8x^2-3x=-5 ...
math - Can someone help me finish this problem I am stuck! 5/4x+1/8x=11/8+x 10/...
algebra - Andrew factored the expression 20x^3-12x^2+8x as 4x(5x^2-12x^2+8x). ...
Algebra - Andrew factored the expression 20x^3-12x^2+8x as 4x (5x^2-12x^2+8x). ...
algerbra 1 - 5x+8+3x-x+5=6x-3 do I start like this 5x+3x-x or 5x+3x+8+5=6x-3 I ...
Algebra 1 HELP - -5(1-5x)+5(-8x-2)=-4x-8x