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anzhelika [568]
3 years ago
15

Completing the square method sucks!!

Mathematics
1 answer:
slamgirl [31]3 years ago
3 0

\huge\underline\purple{Answer ☘}

4x {}^{2}  + 3x + 5 = 0 \\  \\ dividing \: by \: 4... \\  \frac{4x {}^{2} }{4}  +  \frac{3x}{4}  +  \frac{5}{4}  = 0 \\ x {}^{2}  +  \frac{3x}{4}  +  \frac{5}{4}  = 0 \\  \\ we \: know \: that... \\  \: (a + b) {}^{2}  = a {}^{2}  + b {}^{2}  + 2ab \\  \\ here... \\ 2ab =  \frac{3x}{4}  \\  =  > 2xb =  \frac{3x}{4}  \:  \:  \: \:  \:  \:  \:  \:  \:  (a = x) \\ 2b =  \frac{3}{4}  \\ b =  \frac{3}{4}  \times  \frac{1}{2}  =  \frac{3}{8}

<h3>nσw ín σur єquαtíσn... </h3>

x {}^{2}  +  \frac{3x}{4}  +  \frac{5}{4}  = 0 \\ \\adding \: and \: subtracting \:  (\frac{3}{8}){}^{2}  \\  \\  x {}^{2}  +  \frac{3x}{4}  +  \frac{5}{4}  + ( \frac{3}{8} )  {}^{2} { - ( \frac{3}{8} })^{2}  = 0 \\ \\ x {}^{2}  +  \frac{3x}{4}  +  (\frac{3}{8} ) {}^{2}  +  \frac{5}{4}  - ( \frac{3}{8} )  {}^{2}  = 0 \\ \\ (x +  \frac{3}{8} ) {}^{2}  +  \frac{5}{4 }  - ( \frac{3}{8} ) {}^{2}  = 0 \\ \\ (x +  \frac{3}{8} ) {}^{2}  =  (\frac{3}{8} ) {}^{2}  -  \frac{5}{4} \\ \\ (x +  \frac{3}{8} ) {}^{2}  =  \frac{9}{64}  -  \frac{5}{4} \\ \\ (x +  \frac{3}{8} ) {}^{2}  =  \frac{9 - 5(16)}{64}  \\ \\ (x +  \frac{3}{8} ) {}^{2}  =  \frac{9 - 80}{64} \\ \\ (x  +  \frac{3}{8} ) {}^{2}  =  \frac{ - 71}{64}

<h3>ѕíncє.. </h3>

ѕquαrє σf αnч numвєr cαn't вє nєgαtívє..

ѕσ.. αnѕwєr dσєѕ nσt єхíѕt~

hσpє hєlpful~

<h2>~Be Brainly!</h2>
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