81 (a +1)² + 90 (x+1)(y+ 2) + 25 (y+z) square 2
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Step-by-step explanation:
81(a+1)²+90(x+1)(y+2)+25(y+z)²
= 81(a²+2a+1) + 90(xy+2x+y+2)+25(y²+2yz+z²)
= 81a²+162a+81+90xy+180x+90y+180+25y²+50yz+25z²
=81a²+162a+90xy+180x+90y+25y²+50yz+25z²+261
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