If x=3 and y=-1 then what is
3x2+2xy-5= ?
Online "^" is used to indicate an exponent, x^2 = x squared.
3x^2+2xy-5= 3(3^2) + 2(-3) - 5 = ?
To find the value of the expression 3x2 + 2xy - 5 when x = 3 and y = -1, we substitute these values into the expression and perform the calculations.
Step 1: Substitute the values of x and y into the expression.
3(3)2 + 2(3)(-1) - 5
Step 2: Simplify the calculations within the parentheses and exponents.
3(9) + 2(-3) - 5
Step 3: Perform the multiplication.
27 - 6 - 5
Step 4: Perform the addition and subtraction.
27 - 11
Step 5: Calculate the final result.
= 16
So, when x = 3 and y = -1, the value of 3x2 + 2xy - 5 is 16.