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Answer:
x = − 6 ± √ 51
Step-by-step explanation:
The quadratic formula is x= -b ± √b^2-4ac / 2a. A is 1, b is 12, and c would be -15 if we subtract the 15 to the other side. Plugging the numbers in would be x= -12 ± √12^2-4(1)(-15) / 2(1) . x= -12± √144+60/ 2 --> x=-12± √204/2 ---> x= -6± √51