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fgiga [73]
3 years ago
8

Factorize the following:x^2+3x-40

Mathematics
2 answers:
likoan [24]3 years ago
3 0
Your answer would be: (x + 8) • (x - 5)
goldfiish [28.3K]3 years ago
3 0

Answer:

(x-5)(x+8)

x = 5

x = -8

Step-by-step explanation:

x^2+3x-40

Factorise

Two numbers that when added together gives +3 and when multiplied together gives -40.

The two numbers are +8 and -5

+8-5=+3

+8 X-5=-40

Hence, we substitute this two numbers with +3 in the equation above

x^2+8x-5x-40

We group into bracket

(x²+8x)-(5x+40)

In the first bracket, x is common while 5 is common in the second bracket

x(x+8)-5(x+8)

(x-5)(x+8)

x-5=0 x=5

x+8=0 x=-8

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