Hey!
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Steps To Solve:
9x² + 5x − 12 (when x = 4)
~Substitute
9(4)² + 5(4) − 12
~Multiply
9(16) + 20 - 12
~Multiply
144 + 20 - 12
~Add
164 - 12
~Subtract
152
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Hence, the answer is 152!
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Hope This Helped! Good Luck!