If (x+3)(x-5)=x^2 +mx-15, the value of m is...? Pls explain the answer, thx!

Mathematics

2 answers:

Fudgin [204]2 years ago

6 0

The value and the answer is m = -2

katovenus [111]2 years ago

3 0

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let's solve :

first step : we have to expand the term in L.H.S

$(x + 3)(x - 5)$
${x}^{2} - 5x + 3x - 15$
${x}^{2} - 2x - 15$

now, let's equate the equations to find the value of m :

${x}^{2} - 2x - 15 = {x}^{2} + mx - 15$

value of m = -2

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Please explain how you got your answer (:

melisa1 [442]

I used math

anyway
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so

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minus 2n both sides
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minus 2 and 1/2 both sides
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divide both sides by 2
I mean times both sides by 1/2
n=1 and 1/4

answer is C

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