Question

G. Solving Quadratic equations using formula.
a) x2 + 7x = 7 and give your answer correct to one decimal places.
b) (x - 1)2 - 3x + 4 = 0 and give your answer correct to two significant figures​

Answer 1

Answer:

Step-by-step explanation:

a) Given equation is x  

2

+7x=7

⇒x  

2

+7x−7=0

Using the quadratic formula, we get:

x=  

2×1

−7±  

49+28

​  

 

​  

 

⇒x=  

2

−7±  

77

​  

 

​  

=0.89,−7.89

Thus, there are two values of x i.e 0.89 and −7.89 (correct up to two decimal places)

b)