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To get your answer, divide 15 by 180.
180/15 = 12. Now, let's check your work!
15 x 12 = 180. Yay, it's correct!
Well, darling, 15 times what equals 180? That would be 12. You're welcome for doing the math for you. Now go forth and conquer the world with your newfound knowledge.
4x45 = 180
It is 30 times 6 equals 180
15 multiplied by 12 is 180.
So we have x^2 + 3*x = 180 --> x^2 + 3*x - 180 = 0. This can factor into (x-12)(x+15)=0, So x = -15 or x = 12 satisfies it: -15 is the answer. I factored by looking for factors which sum to +3 and multiply to -180
15-3 times 2 equals 15-6 equals 9.