Please help me to solve this question:m²+4m-21=0

Explanation:

a+b=4

ab=1(−21)=−21

−1,21

−3,7

−1+21=20

-3+7=4

a=−3

b=7

(m²−3m)+(7m−21)

m(m−3)+7(m−3)

(m−3)(m+7)

Hope this is correct

m =(-4-√96)/2=-2-2√ 6 = -6.899

m =(-4+√96)/2=-2+2√ 6 = 2.899

Explanation:

the boundarys like convergent divergent and transform it causes subduction

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