Question

how to solve 4r²-100=0​

Answer 1

$4 {x}^{2} - 100 = 0 \\ \\ 4 {x}^{2} = 100 \\ \\ {x}^{2} = \frac{100}{4} \\ \\ {x}^{2} = 25 \\ \\ x = + 5 \\ \\ or \\ \\ x = - 5$

HOPE IT HELPS TO U

Answer 2

Answer:

-5,+5

Step-by-step explanation:

4r²-100=0

a=4,b=0,c=-100

∆=b²-4a

∆=0²-4.4.(100)

∆=1600

The delta value is higher than 0 ,so the equations has 2 solutions.We use following formulas to calculate your solutions

r¹=-b-√∆/2a r² -b-√∆\2a

√∆=1600=40

r¹=b-√∆/2a=-(0)-40/2*4=40/8=-5

r²=-b+√∆\2a=-(0)+40/2*4=40/8=5