solve each quadratic equation. show your work.
1. (2x-1)(x+7)=0
2. x^2+3x=10
3. 4x^2=100

Question

solve each quadratic equation. show your work.
1. (2x-1)(x+7)=0
2. x^2+3x=10
3. 4x^2=100

anonymous · Answer

1. x=12,−7
2. x^2+3x=10
x=±5

anonymous · Answer

For equation 1: 
Ask: When will (2x−1)(x+7) equal zero?
Answer: When 2x−1=0 or x+7=0.
Solve each of the 2 equations above:

campbell_st · Answer

in 1. if either factor equals zero then the quadratic will equal zero. 

so you need to find the values of x that make 

2x - 1 = 0      and    x + 7 = 0 

you will get 2 different values

2. rewrite the equation as $$x^2 + 3x - 10 = 0$$

factor the equation then solve the factors just like question 1. 

3. a lot simpler... divide both sides of the equation by 4
     then take the square root of both sides... 
     remember there are 2 answers, a positive and negative 

hope it helps

anonymous · Answer

For equation 2: 
x2+3x−10=0
x2+3x−10
(x−2)(x+5)=0
x=2,−5

campbell_st · Answer

there you go... someone always posts answers, even though Open Study asks that you don't