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Math question! Solve for x? x^2 + 15x + x + 10 = 90?

x^2 + 15x + x + 10 = 90

I've been trying to get it for hours, I got -12, 20 which I think, well pretty much know are wrong. It IS for homework, but I am not posting this to cheat and plus this is only half of the question, I need to plug it in and find the measures of the angles. Thanks! Please solve for x, and give an explanation please!

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dscq7b3iaa profile image

the proper equation to factor is x^2 + 16x - 80 = 0 ... and 20 - 4 = 16 and 20*-4 = -80

although given the round numbers, I quickly guessed 4 also.

Reference: my brain, and experience