3x+7=4x
Move the 3x to the other side
7= 4x-3x
7=x
Answer:
f(x)=4x
Step-by-step explanation:
Let's look at the progression of f(x) values as the x value goes up. The x value goes up in steps of 1, but the f(x) value goes up in steps of 4. This means that the f(x) value grows 4 times faster than the x value. Comparing them side by side, you can see that each f(x) value is indeed 4 times larger than the corresponding x value. Therefore, the descriptive function is f(x)=4x.
Answer:
Step-by-step explanation:
Xét tam giác AHC và tam giác BAC có
góc AHC = góc BAC =90°
Góc C chung
Suy ra tam giác AHC đồng dạng với tam giác BAC
Suy ra AH×BC=AB×AC
Suy ra h.a=b.c
Suy ra h^2.a^2=b^2.c^2
Suy ra h^2.(b^2+ c^2 )=b^2.c^2
( áp dụng định lí pytago vào tam giác ABC)
Suy ra 1/h^2=c^2+ b^2/b^2.c^2
Suy ra 1/h^2=1/b^2+1/c^2
Answer:
it is in answer
Step-by-step explanation: