Math, asked by michal2, 1 year ago

if -5 is a root of the equation 2 X square + bx - 15 is equals to zero, then find the other root

Answers

Answered by faraanahmedhashmi

hi mate...

given. -5 is a root..

therrfore.

2(-5)^2 + b(-5) - 15=0

50-5b-15=0

35-5b=0

35=5b

b=7..

now the equation is..

2x^2+7x -15

now.

2x^2+10x-3x -15

2x(x +5)-3(x+5)

(x+5)(2x-3)

now equate it to 0

we get..

2x-3=0

x=3/2

the other root is 3/2..

hope it helps ..and happy holi.

michal2: ^ means BRO

faraanahmedhashmi: it means that .. raised to..for example.. 2^2 is. 2 raised to the power 2

faraanahmedhashmi: lly.. 2x^2 is 2 x raised to the power 2 or 2x square..

michal2: hooooo ok Tq BRO

michal2: Hi which lesson it is BRO

faraanahmedhashmi: your class.dr

michal2: means 10th u

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