+0

# help me new topic need explaining and answers

+2
222
3
+77

Find all real values of  that satisfy the equation x(squared) - 7x = 98

Find all real numbers such that the square of the number is 48 more than double the number.

Find all real numbers x that satisfy the equation (x-4)(x-8)= 12

Expand the product: (x+8)(x-9)

Find all real values of t that satisfy the equation t(Squared) =324

thank you guys im just reallly really confused on the subject. it would help a lot thanks!

Dec 6, 2018

#1
+18439
+2

1 Do you know how to use the quadratic formula?   x^2 -7x-98 = 0

2 x^2 -48 = 2x       x^2-2x-48=0     (x-8)(x+6)    so x = 8 or -6

3   expand   x^2-12x+32-12 = 0

x^2-12x+20 = 0     use quadratic formula or just factor it to (x-10)(x-2) = 0    so x = 10 or 2

4  x^2-x-72

5 t^2 = 324    so t = + or - sqrt 324 = +-18

Dec 6, 2018
#2
+77
+1

wait so what is number one, and no i dont know the quadratic equation

Dec 6, 2018
#3
+18439
+1

(x+7)(x-14)= 0   so x =-7 and 14

Quadratic Formula for solving quadratic equations in the for  ax^2 +bx + c = 0 :

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

.
Dec 6, 2018