Q19 of 50 Page 9

If =20, find the value of .

Given that,



Squaring both sides, we get






More from this chapter

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17

Simplify:

(i) 178 × 178 – 22 × 22


(ii)


18

Find the value of x, if:

(i) 4x=(52)2 -(48)2


(ii) 14x=(47)2 -(33)2


 20

If , find the values of and.

 21

If x+y = 4 and xy=2, find the value of x2+y2