+0

# Pls help!!

+1
68
1
+61

Can somone pls help with this?

May 17, 2021

#1
+544
+2

1) 8x2 - 72 = 0

x2 - 9 = 0

x2 = 9

x = ± 3

2) https://gyazo.com/33805f53504404d1923cc25f58131c22 (drew it out for you)

3) $$25x^2 + 20x = 6$$

$$25x^2 + 20x - 6 = 0$$

$$x^2 + \frac{4}{5}x - \frac{6}{25} = 0$$

$$x^2 + \frac{4}{5}x + \frac{4}{25} - \frac{4}{25} - \frac{6}{25} = 0$$

$$(x + \frac{2}{5})^2 - \frac{10}{25} = 0$$

$$(x + \frac{2}{5})^2 = \frac{10}{25}$$

$$x + \frac{2}{5} = \frac{\sqrt{10}}{5}$$

$$x = -\frac{2 ± \sqrt{10}}{5}$$

4) $$4x^2 + 6x = 8$$

$$4x^2 + 6x - 8 = 0$$

$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$

$$x = {-(6) \pm \sqrt{(6)^2-4(4)(-8)} \over 2(4)}$$

$$x = {-6 \pm \sqrt{36+128} \over 8}$$

$$x = {-3 \pm \sqrt{164} \over 4}$$

$$x = {-3 \pm 2\sqrt{41} \over 4}$$

Please tell me if I did anything wrong! :)

May 17, 2021