Question

if $x = 6$ and $y = -4$, evaluate $3x^2 - 5y$
a 88
b 128
c 164
d 104
f 144

Explanation:

Step1: Substitute given values

Substitute $x=6$ and $y=-4$ into $3x^2 - 5y$:
$3(6)^2 - 5(-4)$

Step2: Calculate squared term

Compute $6^2$ first:
$3(36) - 5(-4)$

Step3: Perform multiplication operations

Calculate each product:
$108 + 20$

Step4: Add the resulting values

Sum the two terms:
$108 + 20 = 128$

Answer:

B. 128