Question

solve this questions by using quadratic formula​

Answer 1

Answer:

48)x=-1 and -15

49)x =15 or 2

50) x= -1 or -3/2

51) x= 3/2 or 1

Explanation:

48)

$x = - b \binom{ + }{ - } \sqrt{ {b}^{2} - 4ac} \div 2a$

therefore,

$x = - 16 \binom{ + }{ - } \sqrt{ {16}^{2} - 4 \times 1 \times 15 } \div 2 \times 1 \\ = - 16 \binom{ + }{ - } 14 \div 2 \\ x = - 1 \: and \: x = - 15$

similarly,

49) x=16+14/2. x=16-14/2

x=15. x=1

similarly,

50) x=-5(+-)1/4

x=-1 or -3/2

51) x=5(+-)1/4

x=3/2 or 1

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