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x^2 + 13x + 30 = 0 x^2 + 10x + 3x + 30 = 0 x(x + 10) + 3(x + 10) = 0 (x + 3)(x + 10) = 0 x = -3 or x = -10
20 as 10 x 0 = 0 so is just 10 + 10 = 20
x2+6x-40 = 0 (x+10)(x-4) = 0 x = 4 or x = -10
X 2 + 8x -20 =0(x + 10)(x - 2)= 0x + 10 = 0 ............ x = -10andx - 2 = 0 ................. x = 2x = -10 or 2
2x2+18x = 20 2x2+18x-20 = 0 x2+9x-10 = 0 (x+10)(x-1) = 0 x = -10 or x = 1