1/2*B*(2B+8)=21

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Solution for 1/2*B*(2B+8)=21 equation: 


B in (-oo:+oo)

(1/2)*B*(2*B+8) = 21 // - 21

(1/2)*B*(2*B+8)-21 = 0

1/2*B*(2*B+8)-21 = 0

1/2*B*(2*B+8)-21 = 0

B^2+4*B-21 = 0

B^2+4*B-21 = 0

B^2+4*B-21 = 0

DELTA = 4^2-(-21*1*4)

DELTA = 100

DELTA > 0

B = (100^(1/2)-4)/(1*2) or B = (-100^(1/2)-4)/(1*2)

B = 3 or B = -7

(B+7)*(B-3) = 0

(B+7)*(B-3) = 0

( B+7 )

B+7 = 0 // - 7

B = -7

( B-3 )

B-3 = 0 // + 3

B = 3

B in { -7, 3 }

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