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24 November, 06:04

Find x (Will mark brainliest if you are right)

(-3x + 2) * (45x + 21) + (-4x + 25) = 50

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  1. 24 November, 07:06
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    Step-by-step explanation:

    (-3x + 2) (45x + 21) + (-4x + 25) = 50

    -135x^2 - 63x + 90x + 42 - 4x + 25 = 50

    -135x^2 + 23x + 67 = 50

    -135x^2 + 23x + 67 - 50 = 0

    -135x^2 + 23x + 17 = 0

    quadratic formula : x = (-b ± √b^2 - 4ac) / 2a

    a = - 135, b = 23, c = 17

    x = - 23 ± √23^2 - 4 (-135) (17) / (2 (-135)

    x = (-23 ±√9709) / - 270

    x = 23/270 ± 1 / 270√9709/270

    x = 0.4501 or x = - 0.2798 <== = these answers are rounded
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