Question

find the product (7x+2)(7x-5)
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Answer 1

Answer:

7x(7x+2)-5(7x+2)=0

49x²+14x-35x-10=0

49x²-21x-10=0

b²-4ac= -21²-4x49x(-10)

= 441-(-1960)

=441+1960

=2401

x= -b±√b²-4ac /2a

x= -(-21)±√2401 /2x49

x= 21±√2401 /98

x= 21±49 /98

x= 21+49 /98 or x=21-49 /98

x= 70 /98 or x= -28 /98

x= 0.71 or x= -0.29

are the product