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Q: Factorise x2 plus 8x plus 15?

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x2 + 8x + 15 = (x + 3)(x + 5)

x2 + 8x + 15 = (x + 3) (x + 5).

x2-8x+15 = (x-3)(x-5)

(-4,-1)

x² + 8x + 15 = (x + 5)(x + 3)

If you mean: xsquared+8x-48 then it factors to (x-4)(x+12)

X2 - 8X + 15 = (X - 3)(X - 5)

X2 + 8x + 16 = 10x +16x2 + 8x + 16=2x + 8x + 16=10x + 16

X2 + 4xx(x + 4)=======

(x - 3)(x - 5)

x2 + 2x - 15 = x2 - 3x + 5x - 15 = x(x - 3) + 5(x - 3) = (x + 5)(x - 3)

x2 + 6x = x*(x + 6)

17

x2 + 8x = -15 x2 + 8x + 15 = 0 since 15 = 5 x 3 and 5 + 3 = 8, then (x + 5)(x + 3) = 0 x + 5 = 0 or x + 3 = 0 x = -5 or x = -3

x2 + 8x = x(x+8)

x2 + 8x - 20 = (x - 2)(x + 10).

4(x2 + 4)

x(x+5)

x2 + 8x - 20 = (x - 2)(x + 10).

8x(x2-x+1)

x + 4

y = x2 + 8x + 15 = (x + 3)(x + 5). When y = 0, one or other of the two factors must equal zero; that is, x = -3 or -5, when y = 0.

no

x2-8x+16 = (x-4)(x-4) when factored

x2+8x+9 = -7 x2+8x+9+7 = 0 x2+8x+16 = 0 (x+4)(x+4) = 0 Therefore: x = -4 and also x = -4 (they both have equal roots)