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Coordinate Geometry

Question
CBSEENMA9001849
Wired Faculty App

Expand each of the following using suitable identities:
(x + 2y + 4z)2

Solution

(x + 2y + 4z)2
(x + 2y + 4z)2 = (x)2 + (2y)2 + (4z)2 + 2(x)(2y) + 2(2y)(4z) + 2(4z)(x)
| Using Identity V
= x2 + 4y2 + 16z2 + 4xy + 16yz + 8 zx

Some More Questions From Coordinate Geometry Chapter

Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

4x2 - 3x + 7

Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

x10+ y3 + t50

Write the coefficients of x2 in each of the following:

2 + x2 + x

Write the coefficients of x2 in each of the following:
2 - x2 + x3

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