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katen-ka-za [31]
3 years ago
12

Solve for x 15x^2+16x= -4

Mathematics
2 answers:
Klio2033 [76]3 years ago
4 0
15x²+16x+4 =0      (ax² +bx +c=0)

Δ = b²-4ac =256 - 4×15×4 =16

x1 = (-b+√Δ) / 2a = (-16+√16) / 30 =( -16+4) / 30 = -12/30 = - 2/5
x2 = (-b -√Δ) / 2a = (-16 -√16) / 30 = (-16 -4) /30 = -20/30 = -2/3
Alecsey [184]3 years ago
4 0
      15x² + 16x = -4
15x² + 16x + 4 = -4 + 4
15x² + 16x + 4 = 0
x = <u>-(16) +/- √((16)² - 4(15)(4))</u>
                       2(15)
x = <u>-16 +/- √(256 - 240)</u>
                     30
x = <u>-16 +/- √(16)
</u>              30
x = <u>-16 +/- 4</u>
            30
x = <u>-8 +/- 2</u>
          15
x = <u>-8 + 2</u>  or  x = <u>-8 - 2</u>
         15                  15
x = <u>-6</u>             x = <u>-10</u>
      15                   15
x = ⁻²/₅            x = ⁻²/₃
<u />
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