wrong Or use less answer's will be reported
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Answer:
m = -7.5 , -2
Step-by-step explanation:
4m² + 12m + 21 = -13(2m + 3)
4m² + 12m + 21 = -26m - 39
4m² + 12m + 26m + 21 + 39 = 0
4m² + 38m + 60 = 0
2(2m² + 19m + 30) = 0
2m² + 19m + 30 = 0
Solving the quadratic equation by quadratic formula,
Therefore, m = -7.5 , -2
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Identity used : (a + b)² = a² + b² + 2ab
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