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ALGEBRA ALGEBRA 2. If x2 + =7 x + 18 1 = 7, * # 0, then find the value of Sol. (2) x + = = 2.5 1 x2 х 1 Squaring both sides, x3 2 (1) 19 (2) 28. X = (3) 38 (4) 18 1 1 1 x2 = x + - = + X + + 2 xxx = 6.25 x21 х х. x² = 7+2 = 9 1 x2 = 6.25 -2 = 4.25 :: (x++)* (25) = (a Sol. (4) :: (x++)*=x2 ++2xxx X + X + = 3 .. Squaring both sides again, X 2 Cubing both sides 1 +2 + x2 = (4.25) 3 (x+4)* X + х 1 1 + + 2 xx x = 18.0625 1 .+ 3xxx 1 X + - = 27 х +3+ 73 1 1 + = 18.0625-2 x3 1 + + 3x3 = 27 x3 4 1 + 1 = 16.0625 능 +4 +3 = 27-9=18 + x3 1 1 5. If x-==7 then find the value of x2 + х 3. 1 If x + X = 3, find the value of x4 + 4. (1) 51 (3) 15 (2) 52 (4) 25 ...
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