Answer:
Where is the question?????
Answer:
Option A is correct, i.e. x = -3, x = 7.
Step-by-step explanation:
Given the equation is x² -4x -21 = 0.
We can compare it with general quadratic equation i.e. ax² +bx +c =0.
then a = 1, b = -4, c = -21.
We can use Quadratic formula as follows:-
x = ( -b ± √(b²-4ac) )/2a
x = ( +4 ± √(16-4*1*-21) )/2*1
x = ( +4 ± √(16+84) )/2
x = ( +4 ± √(100) )/2
x = ( +4 ± 10 )/2
x = (4+10)/2 or x = (4-10)/2
x = 14/2 or x = -6/2
x = 7 or x = -3
Hence, option A is correct, i.e. x = -3, x = 7.
Minus
The quadratic equation is
( -b+-SQRT(b^2 - 4ac) )/2a
Answer: Slope: 6-(-6)/2-(-4)=2
Slope:2
Write it in the standard form
Y=2x+b
Find the b
Substitute the y and x
6=2(2)+b
b=2
Here the equation=
Y =2x+2
Step-by-step explanation:
Answer:
6 is the answer
Step-by-step explanation:
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