verify the identity (x+a)(x+b)=x^2+(a+b)x+ab for x=11a=4 and b=-7
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60
Step-by-step explanation:
=(11+4)[11+(-7)]
=11^2+[4+(-7)]11+4*(-7)
=121+[-3*11]-28
=121-33-28
=121-61
=60
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