Answer:
48
Explanation:
Given
4a² + 6a - 3(a + 4) + 15 ← distribute parenthesis
= 4a² + 6a - 3a - 12 + 15 ← collect like terms
= 4a² + 3a + 3 ← substitute a = 3 into the expression
= 4(3)² + 3(3) + 3
= 4(9) + 9 + 3
= 36 + 9 + 3
= 48
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