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11 June, 12:22

Solve using the quadratic formula. Leave Irrational answers in radical form.

x2 + x - 20 = 0

The solutions are

and

+4
Answers (1)
  1. 11 June, 15:25
    0
    x1 = 4

    x2 = - 5

    Step-by-step explanation:

    There is a formula to solve the quadratic equations, which is:

    [-b + - √ (b² - 4 ac) ] / (2a)

    Quadractic equations have this look:

    ax² + bx + c = 0

    You need to stablish the numbers:

    where a, is the number with x², b the x and c, the independent term.

    x² + x - 20 = 0 For this case:

    a = 1; b = 1; c = - 20. We replace in the formula

    [-1 + - √ (1² - 4 1 (-20)) ] / (2.1)

    (-1 + √81) / 2 = 4

    (-1 - √81) / 2 = - 5
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