4 x2
+25y2
+9z2
-20xy-30yz+12zx
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Ans:- 4x² + 25y² + 9z² - 20xy - 30yz + 12zx
= (2x)² + (-5y)² + (3z)² + 2×2x×(-5y) + 2×(-5y)×3z + 2×3z×2x
= (2x - 5y + 3z)²
= (2x - 5y + 3z)(2x - 5y + 3z)
here is your answer
hope it will help you
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