How i solve this question of class 9th ncert math of Polynomials chapter of exercise 2.5 of math of question no.4(3) give me the best answer of this question i want to know the best answer Expand each of the following, using suitable identities:(iii) (−2x+3y+2z)2
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Expand each of the following, using suitable identities:(iii) (−2x+3y+2z)2 Q.4(3)
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Using identity, (x+y+z)2 = x2+y2+z2+2xy+2yz+2zx
Here, x = −2x
y = 3y
z = 2z
(−2x+3y+2z)2 = (−2x)2+(3y)2+(2z)2+(2×−2x×3y)+(2×3y×2z)+(2×2z×−2x)
= 4x2+9y2+4z2–12xy+12yz–8xz