Question

solve for X the quadratic equation (x-1)²- 3x + 4 is equal to zero give your answer correct to two significant figure​

Answer 1

Answer:

Given: (x−1)2−3x+4=0

⇒x2+1−2x−3x+4=0

⇒x2−5x+5=0

Comparing x2−5x+5=0 with ax2+bx+c=0, we get a=1,b=−5,c=5.

∴x=2a−b±b2−4ac

x=2×1(−5)±(−5)2−4(1)(5)

=25±25−20=25±5

=25±2.236=25+2.236 and 25−2.236