Question 384464
My son (14) says there is no solution to his homework question, is he correct 

(w+x)(y+z) 
w*y=4
x*z= -15 
(w*z)+(x*y)=1 
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(w+x)(y+z) = wy+wz+xy+xz
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Substitute to get:
4 + 1 -15 = -10
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Cheers,
Stan H.