Ax + B = Bx + C Ax - Bx = (C - B) x (A - B) = (C - B) x = (C - B) / (A - B)
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x = -c/(a+b), provided a+b is not 0
x2+bx+ax+ab = x2+ax+bx+ab = x(x+a)+b(x+a) = (x+a)(x+b)
3a+ax+3b+bx = 3(a+b)+(a+b)x = (a+b)(3+x)
Two: one is 0, the other is -b/a ax2 + bx + c = 0, but c = 0 ⇒ ax2 + bx + 0 = 0 ⇒ ax2 + bx = 0 ⇒ x(ax + b) = 0 ⇒ x = 0 or (ax + b) = 0 ⇒ x = -b/a
2x - 13x + 42 = x +ax + b a + b = 2(x - 6.5x + 21) = 34 = a + b