Question

Which shows 602 - 402 being evaluated using the difference of squares method? (4 points)

602 - 402 = (3600 + 1600)(3600 - 1600) = 10,400,000
602 - 402 = 3600 - 1600 = 2,000
602 - 402 = (60 - 40)2 = 202 = 400
602 - 402 = (60 + 40)(60 - 40) = (100)(20) = 2,000

Answer 1

i'll give a medal for the first one who ever helps

Answer 2

a^2 - b^2 = (a + b)(a - b)

Answer 3

now plug in a = 60 and b = 40 and what do you get?

Answer 4

? dont have a calculator on me
sorry

Answer 5

you dont need one

replace a by 60 and b by 40 and you'll find your answer

60^2 - 40^2 = (60 +_____)(60 -____)

Answer 6

can you fill in the blanks

Answer 7

can you walk me through this i am a little confused

Answer 8

the general identity for the difference of 2 squares is

a^2 - b^2 = ( a + b)( a - b)

where a and b are 2 numbers

if you replace a by 60 and b by 40 you'll be able to work out the answer

Answer 9

60^2 - 40^2 = (60 +_____)(60 -____) = ?

Answer 10

(60+60)(60-40)??

Answer 11

no the second number in first parentheses is b and b = 40

Answer 12

so the last answer

Answer 13

D right ?

Answer 14

60^2 - 40^2 = (60 +__40___)(60 -_40___)

Answer 15

yes

Answer 16

a^2 - b^2 = (a + b)(a - b)

remember this and you can do any difference of squares problem

Answer 17

thank you so much for helping me with this you gave me a step by step process that i now understand

thanks again

Answer 18

can you help me on another problem?

Answer 19

for ex ample

100 - 81 = 10^2 - 9^2 = (10+9)(10-9) = 19*1 = 19

Answer 20

yes but plz post it separately