1.

Please answer these all 3.

Answer»

14) 25x^2 - 1 + 1 + 25x^2 + 10x = 0
=> 50x^2 +10x = 0 .
=> 10x ( 5x + 1) = 0.
=> x = 0 , -1/5.
Your answer is option D.
15) 249^2 - 248^2 = (249 + 248)(249 - 248). {USING IDENTITY a^2 - b^2 = (a+b)(a-b).}
=> 497 × 1 = 497.
Your answer is option D.
16) 4x^2 + 8x + 3 = 0.
=> 4x^2 + 6x + 2x + 3 = 0. (4×3 = 12 , 6×2 = 12 6+2 = 8)
=> 2x (2x + 3) + 1 (2x + 3) = 0.
=> (2x+3)(2x+1).
Your answer is option B.
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