Slove this problems in quadratic equations....
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7) 17x + 4x^2 - 15 = 0
4x^2 +20x-3x - 15 = 0
4x(x+5) - 3(x+5) = 0
(4x-3) (x+5)
value of x or zeros =
4x-3=0
4x=3
x=3/4,
second , x+5=0
x= -5
8) -2x^2 + x + 21 = 0
- 2x^2 -6x + 7x +21 = 0
-2x(x+3) +7 (x+3)
(7-2x) (x+3)
value of x =
7- 2x=0
2x=7
x=3.5
second ,
x+3=0
x= -3
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