x=3
becaus:
6x=x+15
5x=15 (-x)
x=3 (divided by 5)
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5x+15 = 6x-10 5x-6x = -10-15 -x = -25 x = 25
x=4/3
-15 = 6x + 3 - 3-15 = 6x (3 - 3 = 0)-2.5 = x (-15/6)
5x + x - 6x + 2x = 2x
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)