Question

Solve the following quadratic equation and give the answer correct to two significant figures :
4x² – 7x + 2 = 0


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Answer 1

Answer:

11 is the correct answer

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Given equation :

$\bold \purple{4x ^ 2 - 7x + 2 = 0}$

$\star \bf \: Here \: \\ \bf a = 4 \\ \bf b = - 7 \\ \bf c = 2$

$\bf \: compare \: with \: = ax^ 2 +bx+c=0$

$\bf \: x = \frac{7 ± \sqrt{49 - 32}}{8} \\ \bf \: = \frac{7 ±\sqrt {17 }}{8} \\ \\ \bf \: x = \frac{7 ±4.12}{8} \\ \pmb{Take ( + ve) sign} \\ \bf x = \frac{11.12}{8} \\ \pmb{again \: take ( + ve) sign} \\ \bf \purple{ x = \frac{2.88}{8} = 0.36}$