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TeeganGamil
20.01.2021 •
Mathematics
I need help
Solve each of these quadratic equations,
(a) x2 – 8x + 15 = 0
(c) 3x² + 10x + 7 = 0
(i) 2.x² + 9x = 0
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Ответ:
a) x =3 and x=5
c) x =-1 and![x = \frac{-7}{3}](/tpl/images/1048/1101/4af1f.png)
i) x =0 and![x = \frac{-9}{2}](/tpl/images/1048/1101/228ff.png)
Step-by-step explanation:
a)
Given that the quadratic equation
x² - 8x +15 =0
The factors of 15 = 5 × 3
x² - 5x -3x +15 =0
x(x -5) -3(x-5) =0
(x-3)(x-5) =0
x =3 and x=5
c)
3 x² + 10 x +7 =0
⇒ 3x² + 3x + 7x +7 =0
⇒ 3x (x +1) +7(x+1) =0
⇒ (x+1) ( 3 x +7) =0
⇒ x =-1 and![x = \frac{-7}{3}](/tpl/images/1048/1101/4af1f.png)
i)
2 x ² + 9 x =0
⇒ x( 2 x + 9) =0
⇒ x =0 and 2 x = -9
⇒ x =0 and![x = \frac{-9}{2}](/tpl/images/1048/1101/228ff.png)
Ответ:
nah I'm good
Step-by-step explanation:
thx for the
points tho