3 years ago

Evaluar lo siguiente. - 10+5 = 1

Mathematics

1 answer:

borishaifa [10]3 years ago

4 0

Answer:

see below :) --> vea abajo :)

Step-by-step explanation:

-5 = 1

Subtract -10 and 5. --> Restar -10 and 5.

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Let

x-------> Leila 's profit

y------> Jo's profit

we know that

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romanna [79]

Answer:

$\huge\boxed{(d+7)(d-7)=d^2-49}$

Step-by-step explanation:

$\bold{METHOD\ 1:}\\\\(d+7)(d-7)\qquad|\text{use}\ (a+b)(a-b)=a^2-b^2\\\\=d^2-7^2=d^2-49\\\\\bold{METHOD\ 2:}\\\\(d+7)(d-7)\qquad|\text{use FOIL}\ (a+b)(c+d)=ac+ad+bc+bd\\\\=(d)(d)+(d)(-7)+(7)(d)+(7)(-7)\\\\=d^2-7d+7d-49\qquad|\text{combine like terms}\\\\=d^2+(-7d+7d)-49\\\\=d^2-49$

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