Answer:
The value of the expression at x = 4 is 140
Explanation:
Let us solve the question
∵ The expression is 8x² + 3x
∵ x = 4
→ To find the value of the expression at x = 4 substitute x by 4 in
the expression, then calculate the value of it
∵ The value of the expression = 8(4)² + 3(4)
→ Solve the power first
∴ The value of the expression = 8(16) + 3(4)
→ Simplify each term using multiplication
∴ The value of the expression = 128 + 12
→ Add the terms
∴ The value of the expression = 140
∴ The value of the expression at x = 4 is 140