Question

The roots of the quadratic equation x²-0.04=0 are :
a) 10.2
b) 10.02
c) 0.4
d)2

Answer 1

Step-by-step explanation:

x² - 0.04 = 0

=> x² - (0.2)² = 0

=> (x + 0.2)(x - 0.2) = 0 [Formula :- a² - b² = (a + b)(a - b)]

So (x + 0.2) = 0

=> x = -0.2

Or (x - 0.2) = 0

=> x = 0.2

So the roots of the equation are ±0.2

I couldn't understand your question properly . If the question is to find the number of roots then the answer is option d (which is 2) .

I hope the answer helps you solve your question .

Answer 2

Answer:

Step-by-step explanation:

x^2-0.04=0

x^2=0.04

x=sqrt(4/100)=2/10=0.2