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3 years ago

Solve by factorising. x2 + 10x + 21 = 0

Mathematics

1 answer:

S_A_V [24]3 years ago

6 0

Answer:

×=-7,×=-3

Step-by-step explanation:

plz don't mind my "×"

×^2+10×+21=0

×^2+7×+3×+21=0

rearrange

that is ; ×^2+3×+7×+21=0

(×^2+3×)+(7×+21)=0

×(×+3)+7 (×+3)=0

therefore

(×+7) (×+3)=0

×+7=0 ×+3=0

×= -7 ×=-3

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